Nice ladies and interesting angles. I found the backgrounds more or less distracting in all of them - not so much in the third - and the large whitish area in the front left of the first also distracting.

It's a cute bunch of girls, Roberto, but I have to agree with Ken about #1. Unlike Ken I find the background in #4 even more distracting than the backgrounds in the other three. Also, in #4, I'd dodge the girl's eyes to a brighter level. It almost looks as if somebody's punched her in both eyes.